171221-N-RL456-0130 MAYPORT, Fla. (Dec. 21, 2017) Secretary of Defense Jim Mattis takes questions from Sailors and Marines assigned to commands throughout the Jacksonville, Florida Navy Tri-base area during an all-hands call held on the flight deck of the amphibious assault ship USS Iwo Jima (LHD 7). (U.S. Navy photo by Mass Communication Specialist 2nd Class Hunter S. Harwell/Released)